D-day

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  D-day \D-day\ n.
     1. (Mil.) the day designated for the beginning of a planned
        attack by a military force; in communications the day is
        often otherwise unspecified for security reasons; as, the
        day before D-day the troops will move into position.
        [PJC]


  
     2. 6 June 1944, the day of the landing in France, by troops
        allied against the Germans in World War II.
  
     Syn: 6 June 1944.
          [WordNet 1.5]
  
     3. the day for commencement or execution of any elaborate
        planned activity; -- often used jocosely. [informal]
        [PJC]

From WordNet (r) 2.0 [wn]:

  D-day
       n : day of the allied landing in France, World War II [syn: {6
           June 1944}]